LANGLEY, J.; ZHENG, J. Fixpoints, multipliers and value distribution of certain classes of meromorphic functions. Annales Fennici Mathematici, [S. l.], v. 23, n. 1, p. 133–150, 1998. Disponível em: https://afm.journal.fi/article/view/134911. Acesso em: 10 may. 2024.